It was scanned at 3200 dpi, using a slide scanner, I dont't know how to get it better.

Although I know, it's kind of a taboo, asking questions like this here, I can't help asking myself, how it comes that one can easily find thousands of pitures in the database, that are much more grainy than this one. As the most of these are older, I got the idea, that maybe pictures from the past five years or so, that are not digitally taken but scanned slides are no longer requested at all?